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US EVA-15 by EV1 Doug Wheelock & EV2 Tracy Caldwell-Dyson was terminated without Loop A PM (Pump Module) removal because of a leak at one (M3) of the four QDs (Quick Disconnects) connecting the ammonia lines to the failed PM of the starboard EATCS (External Active Thermal Control System) during demate activities. Torque on the 4 PM bolts remains unbroken. [After Wheelock reconnected the M3 QD on the PM to stop the leak, not enough suit time remained to allow further PM work, due to the time necessary for the crew’s cleanup procedures for assuring than no ammonia was introduced into the pressurized volume of the ISS. EV1 & EV2 began their “campout” last night in the U.S. Airlock (A/L) with hatch closure and depressurization of the Crewlock (CL) from 14.7 to 10.2 psi, followed by mask prebreathe. Following the usual hygiene break/with mask prebreathe for Caldwell-Dyson & Wheelock at 2:35am-3:45am, the A/L hatch was closed again by Shannon Walker & Fyodor Yurchikhin for EVA preps in 10.2 psi, followed by EMU purge (~5:15am-5:30am) and prebreathe in the EMUs (~5:30am-6:20am). Afterwards, with CL depressurization and EV1/EV2 switching to suit power, EVA-15 began at 7:19am EDT. It ended at 3:22pm, lasting 8h 3 min – the longest ISS-EVA and the sixth-longest EVA in history. It was the 148th spacewalk for ISS assembly & maintenance, and the 240th for US astronauts, with a total time of 929 hrs 38 min.] Before the EVA, FE-6 Walker –

Completed the IV (Intravehicular) portion of the EVA “inhibit pad”, i.e., the list of temporary external deactivations in support of the EVA,

Set up the RWS (Robotic Workstation) and DOUG (Dynamic Onboard Ubiquitous Graphics) peripherals with the IPV (International Procedures Viewer) laptop to support SSRMS (Space Station Remote Manipulator System) ops, and

Operated the SSRMS, “flying” Douglas Wheelock during the EVA.

During the spacewalk, CDR Skvortsov assisted Walker on the SSRMS, and FE-5 Yurchikhin worked with her supporting the Campout, prebreathe, EVA prep & post-EVA activities. At wake-up, Fyodor Yurchikhin performed the regular daily early-morning check of the aerosol filters at the Russian Elektron O2 generator which Maxim Suraev had installed on 10/19 in gaps between the BZh Liquid Unit and the oxygen outlet pipe (filter FA-K) plus hydrogen outlet pipe (filter FA-V). [FE-5 again inspected the filters before bedtime this morning, currently a daily requirement per plan, with photographs to be taken if the filter packing is discolored.]

Alex Skvortsov completed the routine daily servicing of the SOZh system (Environment Control & Life Support System, ECLSS) in the SM. [Regular daily SOZh maintenance consists, among else, of checking the ASU toilet facilities, replacement of the KTO & KBO solid waste containers and replacement of EDV-SV waste water and EDV-U urine containers.]

Before their sleeptime, Caldwell-Dyson, Wheelock & Walker were to complete another run of the Reaction Self Test (Psychomotor Vigilance Self Test on the ISS) protocol, today only once. [The experiment consists of a 5-minute reaction time task that allows crewmembers to monitor the daily effects of fatigue on performance while on ISS. The experiment provides objective feedback on neurobehavioral changes in attention, psychomotor speed, state stability, and impulsivity while on ISS missions, particularly as they relate to changes in circadian rhythms, sleep restrictions, and extended work shifts.]

CW/CR (Cell Wall/Resist Wall) in EMCS (European Modular Cultivation System): Complete.DECLIC (Device for the Study of Critical Liquids & Crystallization, CNES/NASA): Currently DECLIC is OFF. The next run will start on 8/27 and run for 15 days. DomeGene (JAXA): Complete.

ERB-2 (Erasmus Recording Binocular, ESA):[ERB-2 aims are to develop narrated video material for various PR & educational products & events, including a 3D interior station view.] “Tracy: The ERB-2 team would like to thank you for your excellent work on ERB-2 operations. You exceeded expectations by being very pro-active in the troubleshooting and commissioning of ERB-2.”

HAIR (JAXA): 1st sampling session for Wheelock and Walker was performed on 7/15.

HDTV System (JAXA): Was delivered by HTV1.

Holter ECG (JAXA): No report.

HQPC (JAXA): Was delivered by 34P.

HREP (HICO/Hyperspectral Imager for the Coastal Ocean & RAIDS/Remote Atmospheric & Ionospheric Detection System/JAXA): HREP is operating but images cannot be downlinked since the Ethernet link is turned off to conserve power. Images are stored onboard and once the Ethernet link is turned on any stored images can be downlinked. Currently 1495 images have been taken to date.

ICE CRYSTAL (JAXA): Complete.

ICV (Integrated Cardiovascular): No report.IMMUNO (Neuroendocrine & Immune Responses in Humans During & After Long Term Stay at ISS): Complete.

INTEGRATED IMMUNE: No report.

InSPACE-2 (Investigating the Structure of Paramagnetic Aggregates from Colloidal Emulsions 2): No report.

MISSE7 (Materials ISS Experiment): MISSE-7 Low Rate Telemetry has been re-enabled at a reduced polling rate which temporarily enables 80% Science return. The long-term solution has been approved for a software patch to the payload MDM software. Estimated on-orbit date of patch is early September.

PCRF (Protein Crystallization Research Facility) Reconfiguration (JAXA): PCRF maintenance will be performed on 7/29-30.PMDIS (Perceptual Motor Deficits in Space): Complete.

POLCA/GRAVIGEN (ESA): Complete.

Pro K: No report.

RadGene & LOH (JAXA): Complete.RadSilk (JAXA): Samples were returned to ground on ULF3.RST/Reaction Self Test (Psychomotor Vigilance Self Test on the ISS): "Tracy, Wheels and Shannon: We appreciate your continued participation in Reaction Self Test! Shannon: Thank you for remembering the Reaction Self Test constraint of two sessions the same day and going out of your way to complete those."

RYUTAI Rack (JAXA): PCRF checkout was performed on 7/29-30 (see PCRF).SAIBO Rack (JAXA): CBEF Rotor replacement was performed on 7/27-28.